Chapter 3: Installing the FT-70
3-29
Example D: High voltage (380v, 440v, etc.) Poly-Phase
Systems (Delta or Wye)
1. This example is identical to Example B except the input to the
transformer is taken from a poly-phase system. All other condi-
tions of Example B apply.
2. Some transformers have an internal electrostatic shield which
should be grounded to Earth ground if possible (however the
FT-70 ground is suitable). This shield may be attached to the
transformer case in some units, or it may have a separate wire
lead. Examine the transformer carefully to determine if it is
shielded and, if so, ground the shield.
Figure 3-27. Main power wiring Example D.
115/230 VAC
6
1
5
2
11 230
3
4
N
Ø1
Ø2
Ø3
78
910
No. Description
1 Plant Power Panel
2 FT-70 Power Junction Box
3 Voltage Select Switch
4 Connect FT-70 pigtail leads
to input power wires
5 FT-70 Ground Stud
6 External Breaker or Disconnect
7 White
8 Blue
9 Black
10 Brown
Industrial Dynamics Company, Ltd. © Form 40256-0600
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